Exam 3: Cell Structure and Genetic Control

Proteins that are partially embedded on one side of the plasma membrane are

Chromatin is comprised of _____________ and ___________.

RNA strands such as siRNA and miRNA can prevent gene expression in mRNA.

Apoptosis involves the activation of enzymes called ____________,which are the cell "executioners" that activate other enzymes in the nucleus that fragment the DNA.

Genes present in heterochromatin are readily expressed.

One possible reason that the proteome is so much larger than the genome is that mRNAs can be spliced in alternative ways thereby increasing the number of products produced from a particular gene.

_____________ RNA has the function of bringing amino acids to the ribosome during translation.

Release of neurotransmitters occurs via

The primarily hydrophilic leader sequence of secretory proteins allows it to be inserted into the cisterna of the endoplasmic reticulum.

How are the phospholipids arranged to form the plasma membrane?

Which of the following is NOT an explanation for how one gene can produce more than one protein?

Cells actively involved in secreting proteins would contain large numbers or quantities of

A cell which is actively involved in the detoxification of chemicals would contain large quantities of

Anticodons found in mRNA allow for base pairing with the codons in tRNA.

Cells which contain large numbers of mitochondria and large amounts of smooth endoplasmic reticulum most likely are

The cytoskeleton of a cell can serve as a railway that can transport organelles and molecules to different intracellular destinations.

The process of gene expression occurs as

What chemical change occurs to histones that will turn on genetic transcription?

The hydrophobic center of the plasma membrane will restrict the movement of water and fat-soluble substances through the membrane.

The family of enzymes in cells activated during apoptosis are